Stop mechanism for elastic-fluid turbines.



PATENTED JUNE 5, 1906.

J; G.. OALLAN. STOP MECHANISM FOR ELASTIC FLUID TURBINES.

APPLICATION FILED NOV. 30, 1904.

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I .n. .lln A M EW. 6 i E 4 'WiLhesses No. 822,248. I PATENTED JUNE 5, 1906.

G.YGALLAN.

.STOP MECHANISM FOR ELASTIC FLUID TURBINES.

APPLICATION FILED NOV. 30, 1904.

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PATENTED JUNE 5, 19-06.

J. G. GALLAN. STOP MECHANISM FOR ELAST IUFLUID TURBINES.

APPLIOATION FILED NOV. 30, 1904.

3 SHEETS-SHEET 3.

UNITED srATEs- "PATENT OFFICE.

. JOHN G. .CALLAN, .OF'LYNN, MASSACHUSETTS, Assicivos 'ro GENERAL ELECTRIC COMPANY, A CORPORATION or NEW YORK.

STOP MECHANISM FOR ELASTIC-FLUID TURB'INES.

Specification of Letters Patent.

Patented June 5, 1906.

Application filed November 30, 1904- Serial No. 234,843.

To all whom it, may concern: 7

Be it known that I, J 01m G. CALLAN, a citizen of the United States, residing at Lynn,

county of Essex, State of Massachusetts, have mvented certain new and useful Improvements in Stop .Mechanisms for Elastic-Fluid rendered more certain and reliable, and this with an apparatus which is of simple con-.

struction.

The nature and scope of m inventionwill be more fully set forth in t e specification and appended claims.

In t e accompanying drawings, which illustrate one embodiment of my invention, Figure 1 is a partial view, in fr'ont elevation, of a turbine and an emergency device for operatin the throttle or shut-01f valve. Fig. 2 is a si e elevation of the same, alsoshowing the cover for the end of the shaft.- Fi 3 is a detail plan view, partly in section, s owing the lever and rod for withdrawing the dogs from.

the suspended weight to permit the latter to close the valve. Fig. 4-. is a partial front elevation of the suspended weight and the pivoted dogs which normally hold it in place.

Figs. 5 and 6' are similar views showing vari ous positions of the dogs and weight. Fig. 7

is a side elevation of the toggle mechanlsm for actuating the valve. Fig. 8 is a detail view showing the toggles collapsed, and Fig. 9 is a perspective view of the lever acted upon by the trigger.

The shaft of the turbine is provided with a centrifugally-acting governor-weight 1 ,which moves outward when the speed of the turbine flat spring. It is also provided an ad-'- exceeds a predetermined'point. Situated in the path of the weight and mounted on a shaft 2 is a lever 3. The opposite end of the shaft is rovided with an arm 4, that normally ho ds the parts from'operatin The lever and arm constitute a trigger or-controlling the action of the rock-shaft 5'. The

arm 3 of the trig or is normally pressed toward the axis of t eturbine-shaft by a small spring, which normall Near the free end of this normally engages the end of the trigger. v Connected to the free end of the arm 6 and to a fixed support is a motor'9in this case a tends to rock the s aft- 5 from left to rig t.

This tendency is opposed by the trigger. When; the weight 1 ii strikes the trigger a sufficient blow to disengage the opposite'end thereof from the 'shoule cross-piece 7, the spring 9 rocks the shaft "5, and the end of thetrigger rides den-8 on-t up the incline 11 on the crosspiece until it engagesthe shoulder 12, also formed on the crosspiece. I may with advantage use a piece of leather, as shown, to prevent injury. -to the trigger and shoulder. As the end of the trigger rides up the incline it swings the arm 3 out of the path .of the weight, so that the latter will not deliver successive blows thereto. It also acts as a stop to limit the angular movement of the rock-shaft.

The upper end of the-rock-shaft is provided With a bearing 13, carried by a frame 14 on the valve-casing 15. Located in the casing is a valve of suitable construction designed to out oh the supply of steam or other motive fluid to the turblne. The valve is rovided with a stem 16, the up er end of which is guided by theframe 14. I ing' surrounding the valve-stem is screw threaded to receive the hand-wheel 17, by

he portion of the valvecas-- means of which the valve can be manually operated. Rigidly mounted on the valvestem is a yoke 18, Fig. 7, and between the ends of the yoke and the hand-wheel are toggles 19, normally standing in a vertical posltion. Situated above the toggle and surrounding the valve-stem is a weight 20, whlch is normally held in suspense by dogs or latches 21, located on op osite sides of the stem and carried by lin s 22. When the latches or supports are withdrawn from the weight, the latter falls and striking the arms or members 23 of the toggle, Fig. 8, causes the same to collapse,-at the same time closing the main or shut-off valve. To the upper en of the rock-shaft is attached an arm 24, the

latter being connected by a rod 25, which passes through the-frame, with a bridleorU- shaped piece 26. The bridle carries ,thelatches 21 and is' itself supported by the links 22, which permit it to have a limited t o-andfro movement. I

The action of the mechanism is' as follows:

. Assuming that the speed of the turbine or the shaft. The rocking of the shaft 5,-due' to the "action of the spring, moves the arm 4 weight-is raised sufficiently to clear the' ends thereof they-fall backinto operative po'si-' blow and causeit to turnthe shaft 2 in its caring. The arm 4 of the, trigger being attached to the shaft will also be moved, disengaging the, free end thereof from the shoulder 8, and the spring 9 rocks the shaft 5 from left to right, and in so doing thefree end of the trigger is caused to ride up the incline 1-1 until it engages the leathcrrcovered stop or shoulder 12.

way of the centrifugal1y-acting weight on 24 to theleft, (the arm extending to'the rear of the shaft) which also moves the bridle and dogs to the left, and thus withdraws the su port from I the weight.

collapse and the valve to close. The blow delivered bythe weight overcomes'any'tendency of the parts to stick.

. To set the parts, a "handle 27 is mounted on the rock-shaft 5. By rotating the shaft against the spring the cross-piece-7 moves to the left and permits the end of the trigger to 1;;opin'to' its normal position, as shown in. i1 1, 4

or latches 21 'are dpivoted, and as the weight is-moved u. war they move around their pivotaas s own in Fig. 6." As soon as the tion. In this'connection it shouldbe noted that the ends of the dogsadjacent to the weight are heavier than the opposite ends. The short ends of the dogs are limited in movements by the sto s 28, carried by the bridle. ,By reason oft 's construction and va'lve stem.

it is possibleto firstset the trigger, &c., and the weight,--which is much easier than This} to set both at once. I

- The next step is to open the valve. is done by rotating the hand-wheel in a direction to straighten the members of the toggles, and as soon as this is done the hand-wheel is rotated in the o posite direction and the valve is opened through the toggles, .yoke,

' :the hand e 27'. is moved to the right, Fig. 1,

which rocks-the shaft 5 and wit draws the latches from the weightand permitsthe latter to'falL' At the same time the trigger must be moved to disengage the shoulder 8'.

This movement of the trigger positively moves the arm 3 out of the jdevice The weight inie ling causes the members of the toggle to tor into operation, A

to said means." I 1 7. In a mechanism of the character da-.

Itwill be seen that the emerg'eisic'y-valve and the main throttle-valveare one and the same.- This is desirable, since itinsures the operation ofv the emergency mechanism each timethe turbine'is shut down, thus reducing to a minimum the liabili-ty'of the mechanism failing to operate automatically when needed.

driven shaft increases above the prescribed. limit, the weight 1 will strike the arm 3 a In accordance with the provisions of the patent statutes I have described the p'nnci ple of operation of'my invention, together with the apparatus which-I now believe to by-I'JettersPatent of the Unitedfstatea-is- 1. In a mechanism of .the character-"do scribed the combination of. a valve, ame'ans for closing the valve, a shaft for controlling the means, a trigger, and'a'-speedresponsive trigger.

scribed, the combination ofa valve, a weight trols tlieaction of the weight, anda speedwhich controls theshaft through the" '2. In a mechanism f of the character deg for moving thevalve, arocksshaft which con-r responsivedevice-which controls the rockshaft. r 3. .In a mechanism'of the character described, the combination oiia valve, a weight ,for closing the valve, a dog for sustaining the weight, a rock-shaft for withdrawing the dog 1 and emitting the weight to drop, and [a spee -responsive device which. controls the. I 7 action of therock-shafh,

e weight is reset byehand. The dogs 1 4; In-"a mechanism of the charm-tende- "scribed, the'co'mbination of a valve, a means for closing the valve, a shaft controlling the,

action of said means, a-motor normally tend- 'ing to move the shaft, amean's opposin this tripping the weight,' amotor normally tending to move the shaft, a weight responsive to second-mentioned weight for starting the mo IOO tendency, and'a device responsive to iij normal conditions *for withdrawing the second mentioned meansv and pen'mtting the motor speed changes, and atrigger moved by the scribed, the combination'of a valve, a governorresponsive to speed changes,- means acted upon by the governor and -controlli-ng governor from delivering successive blows 1 the valve, and a device for preventing the,

scribed, th'efcombination of a valve, a means i .weight er abnormal conditions to cause tripping the valve to move, and a means for holding 8. In a mechanism of the character de scribed, the combination of a weight which is normally suspended, a rock-shaft for with drawing the suspension, a speed-responsive device, a trigger actuated by said device and normally holding it is released by t e trigger.

9. In a mechanism of the character described, the combination of a valve, a weight for moving it, a speedrresponsive device for the weight, a trigger interposed between the weight and device, a spring tending to move the trigger toward said device, and a stop for limiting the movement of the trigger.

the shaft in'a given position, and a springlfor rocking the shaft when 10. In a mechanism of the character, de 2o scribed, the combination of a valve, a weight loosely mounted on the valve spind1.e, a means for sus ending the weight, a pivoted dog included in said means, and as eed-responsive'device for tripping the weig t.

5 11. In a mecha'nism of the character described, the combination of a valve, a weight for closing it, a speed-responsive device, a trigger controlling the action of the weight, and means'for permitting the weight and trigger to be reset by separate. operations.

In witness whereof I have hereunto set my hand this 26th'day of November, 1904.-

' JOHN G. (IALLANV Witnesses: I

J HN A. MOMANUS, Jr., DneALn MoK. -MUKILLOP. 

